Plastics Suck Up Other Toxins: Double Whammy for Marine Life, Gross for Seafood



Photo courtesy of Kent K. Barnes / kentkb

Some plastics are worse than others for the marine life that accidentally or intentionally eat them. That’s because not only are the plastics themselves toxic but some also act as sponges for other toxins. Unfortunately the most commonly produced plastics also absorb the most chemicals. This according to a new study in early view in Environmental Science & Technology

“It surprised us that even after a year some plastics would continue to take up contaminants.”

The researchers measured the absorption of persistent organic pollutants (POPs)—specifically polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs)—to the five most common types of mass-produced plastics:

  • Polyethylene terephthalate (PET). Recycling symbol #1. Example: Water bottles.
  • High-density polyethylene (HDPE). Recycling symbol #2. Example: Detergent bottles. 
  • Polyvinyl chloride (PVC). Recycling symbol #3. Example: Clear food packaging
  • Low-density polyethylene (LDPE). Recycling symbol #4. Example: Plastic shopping bags
  • Polypropylene (PP). Recycling symbol #5. Example: Yogurt containers, bottle caps.

From this research it seems that stuff made from polyethylene and polypropylene likely poses a greater risk to marine animals (and presumably the people that eat them) than products made from PET and PVC. Though the authors note that PVC is carcinogenic and toxic all by itself.

Laysan albatross carcass filled with ingested plastic debris, Midway Island. Nearly all carcasses found here have marine debris in them. It’s estimated that albatross feed their chicks ~10,000 lbs of marine debris annually on Midway. Andy Collins, NOAA Office of National Marine Sanctuaries

The authors were also surprised to find how long the plastics kept absorbing the contaminants. At one site they estimated it would take 44 months for high-density polyethylene to stop absorbing POPs.

“As the plastic continues to degrade, it’s potentially getting more and more hazardous to organisms as they absorb more and more contaminants,” says lead author Chelsea Rochman (UC Davis). 

The research was conducted over a year at five sites in San Diego Bay with pellets of each type of plastic immersed in seawater and retrieved periodically for absorption measurements. 

The paper:

  • Chelsea M. Rochman, Eunha Hoh, Brian T. Hentschel, and Shawn Kaye. Long-Term Field Measurement of Sorption of Organic Contaminants to Five Types of Plastic Pellets: Implications for Plastic Marine Debris. Environmental Science & Technology (2013). 
 

THE END...

of our fiscal year is Thursday, June 30, and we have a much larger fundraising gap than we can easily manage with only days left to go.

Right now is no time to come up short: If you value the hard-hitting, democracy-protecting, justice-advancing journalism you get from Mother Jones, please help us keep charging as hard as we possibly can with a much-needed and much-appreciated donation today.

payment methods

THE END...

of our fiscal year is Thursday, June 30, and we have a much larger fundraising gap than we can easily manage with only days left to go.

Right now is no time to come up short: If you value the hard-hitting, democracy-protecting, justice-advancing journalism you get from Mother Jones, please help us keep charging as hard as we possibly can with a much-needed and much-appreciated donation today.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate